CEO of Good Think, Inc. Shawn Achor gave a TED talk in 2011 about the correlation between happiness and the quality of work you produce. The core of his message is that you learn and work better when you're happy.
For the most part I agree with Shaun, especially when he says:
"The absence of disease is not health," and
"The brain releases dopamine when you're happy, which activates all your learning centres."
A happy learner is a better learner.
I will add to this that the mere feeling of being interested in something spawns happiness. When you indulge in an activity that's stimulating, fun and thought provoking, there's little chance you're going to feel sorrow. Barring personal problems at home or the grief of a loss, you're going feel deep, unconditional fulfillment when you do something that turns you on.
If interest equates to happiness, then having an interest in what you do will activate your learning centres and allow you to unleash much more creativity and productivity. Doing what you love then is not just a pleasantry, but an actual boost to your abilities.
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